These are Cherry MX type keycaps custom UV printed by WASD keyboards.

As shown in the photographs, the set includes the standard keys for the SDK-85+ and the extra CNTL & RST6.5 keycaps that is used in the SDK-85+ project. The original SDK-85 VECT INTR has been renamed RST 7.5 to distinguish it from RST 6.5. There are also several extra key caps that can be used for the undefined function keys, F1, F2, and F3.

There is a design file on the project website (shown in photographs) if you would like to order directly from WASD keyboards.

HS Code 847310 Parts and accessories for typewriters or word-processing machines of heading 8469